Redox non-innocent bis(2,6-diimine-pyridine) ligand-iron complexes as anolytes for flow battery applications

Diiminepyridines are a well-known class of "non-innocent" ligands that confer additional redox activity to coordination complexes beyond metal-centred oxidation/reduction. Here, we demonstrate that metal coordination complexes (MCCs) of diiminepyridine (DIP) ligands with iron are suitable...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2017-12, Vol.46 (47), p.16439-16445
Main Authors: Duarte, Gabriel M, Braun, Jason D, Giesbrecht, Patrick K, Herbert, David E
Format: Article
Language:English
Subjects:
Anolytes
Coordination compounds
Flow stability
Iron
Ligands
Oxidation
Rechargeable batteries
Reduction (metal working)
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Summary:Diiminepyridines are a well-known class of "non-innocent" ligands that confer additional redox activity to coordination complexes beyond metal-centred oxidation/reduction. Here, we demonstrate that metal coordination complexes (MCCs) of diiminepyridine (DIP) ligands with iron are suitable anolytes for redox-flow battery applications, with enhanced capacitance and stability compared with bipyridine analogs, and access to storage of up to 1.6 electron equivalents. Substitution of the ligand is shown to be a key factor in the cycling stability and performance of MCCs based on DIP ligands, opening the door to further optimization.
ISSN:1477-9226
1477-9234
DOI:10.1039/c7dt03915h